calling a controller from another controller.

[eluser]nealumney[/eluser]
Hi Folks,

I have a process which validates whether as user is logged in, or a session has ended (thank you CI for making this very easy). But if the session has ended, or the user is not logged in, I want to re-direct them to a login page. If they are logged in then I want the controller to carry on as if nothing had happened. Is there anyway to use CI to re-direct the user to another controller? Or do I just use standard php to re-direct?

Thanks,

Neal